908 Devices SVP sells 27,656 shares after option exercise
A 908 Devices SVP exercised options and sold 27,656 MASS shares in mid-September 2026 under a Rule 10b5-1 trading plan.
Rhea-AI Filing Summary
908 Devices Inc. executive John Kenneweg, Senior Vice President of Sales & Product Marketing, reported option exercises and related sales of company stock. On September 15–17, 2026, he exercised stock options to acquire a total of 27,656 shares of common stock at an exercise price of $0.96 per share and sold the same number of shares in open-market or private transactions at weighted average prices of $10.00, $10.11, and $10.22 per share, respectively.
The trades were made pursuant to a Rule 10b5-1 trading plan adopted on June 12, 2026, and the options exercised were fully vested and immediately exercisable.
Positive
- None.
Negative
- None.
Insider Trade Summary 10b5-1
Exercise and Sale: 27,656 shares ($254K approx. pre-tax spread)
Exercise and Sale
9 txns
Insider
Kenneweg John
Role
SVP, Sales & Product Marketing
Sold
27,656 shs ($280K)
Approx. gross sale proceeds
$280K
Approx. exercise cost
$27K
Approx. pre-tax spread
$254K
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Stock Option (right to buy) F1, F4 | 5,257 | $0.00 | $0.00 |
| Exercise | Common Stock F1 | 5,257 | $0.96 | $5K |
| Sale | Common Stock F1, F3 | 5,257 | $10.22 | $54K |
| Exercise | Stock Option (right to buy) F1, F4 | 21,399 | $0.00 | $0.00 |
| Exercise | Common Stock F1 | 21,399 | $0.96 | $21K |
| Sale | Common Stock F1, F2 | 21,399 | $10.11 | $216K |
| Exercise | Stock Option (right to buy) F1, F4 | 1,000 | $0.00 | $0.00 |
| Exercise | Common Stock F1 | 1,000 | $0.96 | $960.00 |
| Sale | Common Stock F1 | 1,000 | $10.00 | $10K |
Holdings After Transaction:
Stock Option (right to buy) — 0 contracts (Direct);
Common Stock — 57,784 shares (Direct)
Footnotes (4)
- F1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 12, 2026.
- F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.00 to $10.32 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.13 to $10.29 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- F4. The shares underlying the option are fully vested and immediately exercisable.
Key Figures
Shares sold: 27,656 shares
Shares acquired via option exercise: 27,656 shares
Option exercise price: $0.96 per share
+4 more
7 metrics
Shares sold
27,656 shares
Total 908 Devices Inc. common shares sold by John Kenneweg on September 15–17, 2026
Shares acquired via option exercise
27,656 shares
Total shares received from exercising stock options on September 15–17, 2026
Option exercise price
$0.96 per share
Exercise price for options converted into common stock
Weighted average sale price September 15, 2026
$10.00 per share
Shares sold with individual prices ranging from $10.00 to $10.32
Weighted average sale price September 16, 2026
$10.11 per share
Shares sold with individual prices ranging from $10.00 to $10.32
Weighted average sale price September 17, 2026
$10.22 per share
Shares sold with individual prices ranging from $10.13 to $10.29
Rule 10b5-1 plan adoption date
June 12, 2026
Date John Kenneweg adopted the trading plan used for these transactions
Key Terms
Rule 10b5-1 trading plan, weighted average price, stock option
3 terms
Rule 10b5-1 trading plan regulatory
"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted"
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
weighted average price financial
"The price reported in Column 4 is a weighted average price."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
stock option financial
"The shares underlying the option are fully vested and immediately exercisable."
A stock option is a contract that gives you the right to buy or sell a company's stock at a specific price within a certain time frame. People use them to potentially make money if the stock's price moves favorably or to protect against losses. It's like holding a coupon that can be used to buy or sell stock at a set price later on.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What insider transactions did MASS report for John Kenneweg in this Form 4?
The filing reports that John Kenneweg exercised options to acquire 27,656 shares of 908 Devices Inc. common stock at $0.96 per share and sold 27,656 shares in open-market or private transactions on September 15–17, 2026.
Were John Kenneweg’s MASS stock trades under a Rule 10b5-1 plan?
Yes. The filing states the transactions were made pursuant to a Rule 10b5-1 trading plan adopted by John Kenneweg on June 12, 2026, indicating the trades followed a pre-established schedule.
What were the terms of the options exercised by John Kenneweg at MASS?
The options had an exercise price of $0.96 per share and were described as fully vested and immediately exercisable, with an expiration date of December 2, 2026, for the options exercised in these transactions.
AI-generated analysis. How Rhea-AI works. Not financial advice.
